| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.metamodel.membrane.app.registry.file; |
| |
| import java.io.File; |
| import java.io.FileFilter; |
| import java.io.IOException; |
| import java.io.UncheckedIOException; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.stream.Collectors; |
| |
| import org.apache.metamodel.DataContext; |
| import org.apache.metamodel.factory.DataContextProperties; |
| import org.apache.metamodel.membrane.app.config.JacksonConfig; |
| import org.apache.metamodel.membrane.app.exceptions.DataSourceAlreadyExistException; |
| import org.apache.metamodel.membrane.app.exceptions.NoSuchDataSourceException; |
| import org.apache.metamodel.membrane.app.registry.AbstractDataSourceRegistry; |
| import org.apache.metamodel.membrane.app.registry.DataContextSupplier; |
| import org.apache.metamodel.membrane.app.registry.TenantContext; |
| import org.apache.metamodel.membrane.controllers.model.RestDataSourceDefinition; |
| |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.google.common.base.Strings; |
| |
| public class FileBasedDataSourceRegistry extends AbstractDataSourceRegistry { |
| |
| private static final ObjectMapper OBJECT_MAPPER = JacksonConfig.getObjectMapper(); |
| private static final String DATASOURCE_FILE_SUFFIX = ".json"; |
| private static final String DATASOURCE_FILE_PREFIX = "ds_"; |
| |
| private final File directory; |
| |
| public FileBasedDataSourceRegistry(TenantContext tenantContext, File directory) { |
| super(tenantContext); |
| this.directory = directory; |
| } |
| |
| @Override |
| public List<String> getDataSourceNames() { |
| final File[] files = directory.listFiles(new FileFilter() { |
| @Override |
| public boolean accept(File file) { |
| if (file.isDirectory()) { |
| final String filename = file.getName(); |
| if (filename.startsWith(DATASOURCE_FILE_PREFIX) && filename.endsWith(DATASOURCE_FILE_SUFFIX)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| }); |
| return Arrays.stream(files).map(f -> getDataSourceName(f)).collect(Collectors.toList()); |
| } |
| |
| private String getDataSourceName(File file) { |
| final String filename = file.getName(); |
| return filename.substring(DATASOURCE_FILE_PREFIX.length(), filename.length() - DATASOURCE_FILE_SUFFIX.length()); |
| } |
| |
| private File getDataSourceFile(String name) { |
| final String filename = DATASOURCE_FILE_PREFIX + name + DATASOURCE_FILE_SUFFIX; |
| return new File(directory, filename); |
| } |
| |
| @Override |
| public String registerDataSource(String dataSourceName, DataContextProperties dataContextProperties) |
| throws DataSourceAlreadyExistException { |
| if (Strings.isNullOrEmpty(dataSourceName)) { |
| throw new IllegalArgumentException("DataSource name cannot be null or empty"); |
| } |
| final File file = getDataSourceFile(dataSourceName); |
| if (file.exists()) { |
| throw new DataSourceAlreadyExistException(dataSourceName); |
| } |
| |
| final RestDataSourceDefinition dataSource = new RestDataSourceDefinition(dataContextProperties); |
| try { |
| OBJECT_MAPPER.writeValue(file, dataSource); |
| } catch (IOException e) { |
| throw new UncheckedIOException(e); |
| } |
| return dataSourceName; |
| } |
| |
| @Override |
| public DataContext openDataContext(String dataSourceName) throws NoSuchDataSourceException { |
| if (Strings.isNullOrEmpty(dataSourceName)) { |
| throw new IllegalArgumentException("DataSource name cannot be null or empty"); |
| } |
| final File file = getDataSourceFile(dataSourceName); |
| if (!file.exists()) { |
| throw new NoSuchDataSourceException(dataSourceName); |
| } |
| |
| final RestDataSourceDefinition dataSource; |
| try { |
| dataSource = OBJECT_MAPPER.readValue(file, RestDataSourceDefinition.class); |
| } catch (IOException e) { |
| throw new UncheckedIOException(e); |
| } |
| |
| final DataContextSupplier supplier = |
| createDataContextSupplier(dataSourceName, dataSource.toDataContextProperties()); |
| return supplier.get(); |
| } |
| |
| @Override |
| public void removeDataSource(String dataSourceName) throws NoSuchDataSourceException { |
| if (Strings.isNullOrEmpty(dataSourceName)) { |
| throw new IllegalArgumentException("DataSource name cannot be null or empty"); |
| } |
| final File file = getDataSourceFile(dataSourceName); |
| if (!file.exists()) { |
| throw new NoSuchDataSourceException(dataSourceName); |
| } |
| |
| final boolean deleted = file.delete(); |
| if (!deleted) { |
| throw new UncheckedIOException(new IOException("Unable to delete file: " + file)); |
| } |
| } |
| } |